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Angle grinder's a great tool that I've used for decades. Indispensable for building bikes. And mine taught me a few things last month.
1. Wear a face shield. Not just your glasses
2. Don't remove the handle. Use it.
3. Keep the guard in place.
4. Avoid re-entering an existing kerf.
If you forego 1-4 above, I'd offer alternative suggestions
1. Check your health insurance coverage
2. Check your dental insurance coverage
3. Keep some red towels around the shop
4. Have a driver or ambulance standing by
5. Stock up on some natty eye patches
I could explain how I know these things, but a picture tells it better.